Effect of different closures on the dynamics of bubble-columns flows

1
Effect of different closures on the dynamics of
bubble-columns flows
Gas Outlet
Gas Outlet
M. RAFIQUE, M. H. AL-DAHHAN, M. P. DUDUKOVIC

• Ph.D. in Fluid Mechanics (1999) Institut
  National
• Polytechnique de Lorraine, Nancy, France
• Research associate in CREL (2000)

CREL Annual Meeting, 2001 November 15, 2001
Gas Inlet
Gas Inlet
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Introduction

• A number of CFD studies have been recently
  reported on (2D/3D) bubble column flows
• Two different approaches are commonly used
• Euler-Lagrange
• Euler-Euler
• Euler-Euler approach?low computational cost
  ?widely used
• Euler-Euler simulations of bubble column flow
  have shown promise for capturing the reactor
  scale flow pattern and mixing
• Euler-Euler approach needs extra-considerations
  of the closures of interface momentum exchange.

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Overall Objectives

• Evaluate systematically the effect of available
  closures for interfacial exchange phenomena in
  bubble column flows modeled by the Euler-Euler
  approach by comparing the results with published
  experimental data and numerical investigations.
• Provide users with guidance as to what closures
  to use.

Gas Inlet
Gas Inlet
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Mudde et al. 1997
Pan et al. 2000
This study
D15.2 cm
D15.2 cm
Depth
Depth
D15.2 cm
width
width
1.27 cm
width
Infinite
Infinite
Infinite
1.27 cm
Upper section
10 cm
10 cm
L10D 152 cm
L10D 152 cm
Middle section
L110 cm
10 cm
10 cm
10 cm
Lower section
10 cm
10 cm
Axial averaging
Ug1cm/s
Ug1cm/s
Ug1cm/s
0.16 cm
0.2 cm
0.2 cm
4
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